If a broker does not agree to board you under a highly regulated body like FCA, ASIC or CySec, if you live in the regulatory jurisdiction, run away from that broker.
Always ask for an STP/ECN account as a trader with the broker.
In unregulated jurisdictions, chances are your trades are executed on the brokers dealing desk, not via a liquidity provider.
In such case, there is a conflict of interest between you and the broker.